[linux-2.6-block.git] / drivers / mfd / arizona-irq.c

/*
 * Arizona interrupt support
 *
 * Copyright 2012 Wolfson Microelectronics plc
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>

#include <linux/mfd/arizona/core.h>
#include <linux/mfd/arizona/registers.h>

#include "arizona.h"

static int arizona_map_irq(struct arizona *arizona, int irq)
{
	int ret;

	ret = regmap_irq_get_virq(arizona->aod_irq_chip, irq);
	if (ret < 0)
		ret = regmap_irq_get_virq(arizona->irq_chip, irq);

	return ret;
}

int arizona_request_irq(struct arizona *arizona, int irq, char *name,
			   irq_handler_t handler, void *data)
{
	irq = arizona_map_irq(arizona, irq);
	if (irq < 0)
		return irq;

	return request_threaded_irq(irq, NULL, handler, IRQF_ONESHOT,
				    name, data);
}
EXPORT_SYMBOL_GPL(arizona_request_irq);

void arizona_free_irq(struct arizona *arizona, int irq, void *data)
{
	irq = arizona_map_irq(arizona, irq);
	if (irq < 0)
		return;

	free_irq(irq, data);
}
EXPORT_SYMBOL_GPL(arizona_free_irq);

int arizona_set_irq_wake(struct arizona *arizona, int irq, int on)
{
	irq = arizona_map_irq(arizona, irq);
	if (irq < 0)
		return irq;

	return irq_set_irq_wake(irq, on);
}
EXPORT_SYMBOL_GPL(arizona_set_irq_wake);

static irqreturn_t arizona_boot_done(int irq, void *data)
{
	struct arizona *arizona = data;

	dev_dbg(arizona->dev, "Boot done\n");

	return IRQ_HANDLED;
}

static irqreturn_t arizona_ctrlif_err(int irq, void *data)
{
	struct arizona *arizona = data;

	/*
	 * For pretty much all potential sources a register cache sync
	 * won't help, we've just got a software bug somewhere.
	 */
	dev_err(arizona->dev, "Control interface error\n");

	return IRQ_HANDLED;
}

static irqreturn_t arizona_irq_thread(int irq, void *data)
{
	struct arizona *arizona = data;
	int i, ret;

	ret = pm_runtime_get_sync(arizona->dev);
	if (ret < 0) {
		dev_err(arizona->dev, "Failed to resume device: %d\n", ret);
		return IRQ_NONE;
	}

	/* Check both domains */
	for (i = 0; i < 2; i++)
		handle_nested_irq(irq_find_mapping(arizona->virq, i));

	pm_runtime_mark_last_busy(arizona->dev);
	pm_runtime_put_autosuspend(arizona->dev);

	return IRQ_HANDLED;
}

static void arizona_irq_enable(struct irq_data *data)
{
}

static void arizona_irq_disable(struct irq_data *data)
{
}

static struct irq_chip arizona_irq_chip = {
	.name			= "arizona",
	.irq_disable		= arizona_irq_disable,
	.irq_enable		= arizona_irq_enable,
};

static int arizona_irq_map(struct irq_domain *h, unsigned int virq,
			      irq_hw_number_t hw)
{
	struct regmap_irq_chip_data *data = h->host_data;

	irq_set_chip_data(virq, data);
	irq_set_chip_and_handler(virq, &arizona_irq_chip, handle_edge_irq);
	irq_set_nested_thread(virq, 1);

	/* ARM needs us to explicitly flag the IRQ as valid
	 * and will set them noprobe when we do so. */
#ifdef CONFIG_ARM
	set_irq_flags(virq, IRQF_VALID);
#else
	irq_set_noprobe(virq);
#endif

	return 0;
}

static struct irq_domain_ops arizona_domain_ops = {
	.map	= arizona_irq_map,
	.xlate	= irq_domain_xlate_twocell,
};

int arizona_irq_init(struct arizona *arizona)
{
	int flags = IRQF_ONESHOT;
	int ret, i;
	const struct regmap_irq_chip *aod, *irq;

	switch (arizona->type) {
#ifdef CONFIG_MFD_WM5102
	case WM5102:
		aod = &wm5102_aod;
		irq = &wm5102_irq;
		break;
#endif
	default:
		BUG_ON("Unknown Arizona class device" == NULL);
		return -EINVAL;
	}

	if (arizona->pdata.irq_active_high) {
		ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1,
					 ARIZONA_IRQ_POL, 0);
		if (ret != 0) {
			dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n",
				ret);
			goto err;
		}

		flags |= IRQF_TRIGGER_HIGH;
	} else {
		flags |= IRQF_TRIGGER_LOW;
	}

	/* Allocate a virtual IRQ domain to distribute to the regmap domains */
	arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops,
					      arizona);
	if (!arizona->virq) {
		ret = -EINVAL;
		goto err;
	}

	ret = regmap_add_irq_chip(arizona->regmap,
				  irq_create_mapping(arizona->virq, 0),
				  IRQF_ONESHOT, -1, aod,
				  &arizona->aod_irq_chip);
	if (ret != 0) {
		dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
		goto err_domain;
	}

	ret = regmap_add_irq_chip(arizona->regmap,
				  irq_create_mapping(arizona->virq, 1),
				  IRQF_ONESHOT, -1, irq,
				  &arizona->irq_chip);
	if (ret != 0) {
		dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
		goto err_aod;
	}

	/* Make sure the boot done IRQ is unmasked for resumes */
	i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE);
	ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT,
				   "Boot done", arizona);
	if (ret != 0) {
		dev_err(arizona->dev, "Failed to request boot done %d: %d\n",
			arizona->irq, ret);
		goto err_boot_done;
	}

	/* Handle control interface errors in the core */
	i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR);
	ret = request_threaded_irq(i, NULL, arizona_ctrlif_err, IRQF_ONESHOT,
				   "Control interface error", arizona);
	if (ret != 0) {
		dev_err(arizona->dev, "Failed to request boot done %d: %d\n",
			arizona->irq, ret);
		goto err_ctrlif;
	}

	ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread,
				   flags, "arizona", arizona);

	if (ret != 0) {
		dev_err(arizona->dev, "Failed to request IRQ %d: %d\n",
			arizona->irq, ret);
		goto err_main_irq;
	}

	return 0;

err_main_irq:
	free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
err_ctrlif:
	free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
err_boot_done:
	regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
			    arizona->irq_chip);
err_aod:
	regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
			    arizona->aod_irq_chip);
err_domain:
err:
	return ret;
}

int arizona_irq_exit(struct arizona *arizona)
{
	free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
	free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
	regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
			    arizona->irq_chip);
	regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
			    arizona->aod_irq_chip);
	free_irq(arizona->irq, arizona);

	return 0;
}
Commit	Line	Data
966cdc96 MB	1	/*
	2	* Arizona interrupt support
	3	*
	4	* Copyright 2012 Wolfson Microelectronics plc
	5	*
	6	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*/
	12
	13	#include <linux/delay.h>
	14	#include <linux/gpio.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/irq.h>
	17	#include <linux/irqdomain.h>
	18	#include <linux/module.h>
	19	#include <linux/pm_runtime.h>
	20	#include <linux/regmap.h>
	21	#include <linux/regulator/consumer.h>
	22	#include <linux/slab.h>
	23
	24	#include <linux/mfd/arizona/core.h>
	25	#include <linux/mfd/arizona/registers.h>
	26
	27	#include "arizona.h"
	28
	29	static int arizona_map_irq(struct arizona *arizona, int irq)
	30	{
	31	int ret;
	32
	33	ret = regmap_irq_get_virq(arizona->aod_irq_chip, irq);
	34	if (ret < 0)
	35	ret = regmap_irq_get_virq(arizona->irq_chip, irq);
	36
	37	return ret;
	38	}
	39
	40	int arizona_request_irq(struct arizona arizona, int irq, char name,
	41	irq_handler_t handler, void *data)
	42	{
	43	irq = arizona_map_irq(arizona, irq);
	44	if (irq < 0)
	45	return irq;
	46
	47	return request_threaded_irq(irq, NULL, handler, IRQF_ONESHOT,
	48	name, data);
	49	}
	50	EXPORT_SYMBOL_GPL(arizona_request_irq);
	51
	52	void arizona_free_irq(struct arizona arizona, int irq, void data)
	53	{
	54	irq = arizona_map_irq(arizona, irq);
	55	if (irq < 0)
	56	return;
	57
	58	free_irq(irq, data);
	59	}
	60	EXPORT_SYMBOL_GPL(arizona_free_irq);
	61
	62	int arizona_set_irq_wake(struct arizona *arizona, int irq, int on)
	63	{
	64	irq = arizona_map_irq(arizona, irq);
65	if (irq < 0)
66	return irq;
67
68	return irq_set_irq_wake(irq, on);
69	}
70	EXPORT_SYMBOL_GPL(arizona_set_irq_wake);
71
72	static irqreturn_t arizona_boot_done(int irq, void *data)
73	{
74	struct arizona *arizona = data;
75
76	dev_dbg(arizona->dev, "Boot done\n");
77
78	return IRQ_HANDLED;
79	}
80
81	static irqreturn_t arizona_ctrlif_err(int irq, void *data)
82	{
83	struct arizona *arizona = data;
84
85	/*
86	* For pretty much all potential sources a register cache sync
87	* won't help, we've just got a software bug somewhere.
88	*/
89	dev_err(arizona->dev, "Control interface error\n");
90
91	return IRQ_HANDLED;
92	}
93
94	static irqreturn_t arizona_irq_thread(int irq, void *data)
95	{
96	struct arizona *arizona = data;
97	int i, ret;
98
99	ret = pm_runtime_get_sync(arizona->dev);
100	if (ret < 0) {
101	dev_err(arizona->dev, "Failed to resume device: %d\n", ret);
102	return IRQ_NONE;
103	}
104
105	/* Check both domains */
106	for (i = 0; i < 2; i++)
107	handle_nested_irq(irq_find_mapping(arizona->virq, i));
108
109	pm_runtime_mark_last_busy(arizona->dev);
110	pm_runtime_put_autosuspend(arizona->dev);
111
112	return IRQ_HANDLED;
113	}
114
115	static void arizona_irq_enable(struct irq_data *data)
116	{
117	}
118
119	static void arizona_irq_disable(struct irq_data *data)
120	{
121	}
122
123	static struct irq_chip arizona_irq_chip = {
124	.name = "arizona",
125	.irq_disable = arizona_irq_disable,
126	.irq_enable = arizona_irq_enable,
127	};
128
129	static int arizona_irq_map(struct irq_domain *h, unsigned int virq,
130	irq_hw_number_t hw)
131	{
132	struct regmap_irq_chip_data *data = h->host_data;
133
134	irq_set_chip_data(virq, data);
135	irq_set_chip_and_handler(virq, &arizona_irq_chip, handle_edge_irq);
136	irq_set_nested_thread(virq, 1);
137
138	/* ARM needs us to explicitly flag the IRQ as valid
139	* and will set them noprobe when we do so. */
140	#ifdef CONFIG_ARM
141	set_irq_flags(virq, IRQF_VALID);
142	#else
143	irq_set_noprobe(virq);
144	#endif
145
146	return 0;
147	}
148
149	static struct irq_domain_ops arizona_domain_ops = {
150	.map = arizona_irq_map,
151	.xlate = irq_domain_xlate_twocell,
152	};
153
154	int arizona_irq_init(struct arizona *arizona)
155	{
156	int flags = IRQF_ONESHOT;
157	int ret, i;
158	const struct regmap_irq_chip aod, irq;
159
160	switch (arizona->type) {
863df8d5	161	#ifdef CONFIG_MFD_WM5102
966cdc96 MB	162	case WM5102:
	163	aod = &wm5102_aod;
	164	irq = &wm5102_irq;
	165	break;
863df8d5	166	#endif
966cdc96 MB	167	default:
	168	BUG_ON("Unknown Arizona class device" == NULL);
	169	return -EINVAL;
	170	}
	171
	172	if (arizona->pdata.irq_active_high) {
	173	ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1,
	174	ARIZONA_IRQ_POL, 0);
	175	if (ret != 0) {
	176	dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n",
	177	ret);
	178	goto err;
	179	}
	180
	181	flags \|= IRQF_TRIGGER_HIGH;
	182	} else {
	183	flags \|= IRQF_TRIGGER_LOW;
	184	}
	185
	186	/* Allocate a virtual IRQ domain to distribute to the regmap domains */
	187	arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops,
	188	arizona);
	189	if (!arizona->virq) {
	190	ret = -EINVAL;
	191	goto err;
	192	}
	193
	194	ret = regmap_add_irq_chip(arizona->regmap,
	195	irq_create_mapping(arizona->virq, 0),
	196	IRQF_ONESHOT, -1, aod,
	197	&arizona->aod_irq_chip);
	198	if (ret != 0) {
	199	dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
	200	goto err_domain;
	201	}
	202
	203	ret = regmap_add_irq_chip(arizona->regmap,
	204	irq_create_mapping(arizona->virq, 1),
	205	IRQF_ONESHOT, -1, irq,
	206	&arizona->irq_chip);
	207	if (ret != 0) {
	208	dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret);
	209	goto err_aod;
	210	}
	211
	212	/* Make sure the boot done IRQ is unmasked for resumes */
	213	i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE);
	214	ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT,
	215	"Boot done", arizona);
	216	if (ret != 0) {
	217	dev_err(arizona->dev, "Failed to request boot done %d: %d\n",
	218	arizona->irq, ret);
	219	goto err_boot_done;
	220	}
	221
	222	/* Handle control interface errors in the core */
	223	i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR);
	224	ret = request_threaded_irq(i, NULL, arizona_ctrlif_err, IRQF_ONESHOT,
	225	"Control interface error", arizona);
	226	if (ret != 0) {
	227	dev_err(arizona->dev, "Failed to request boot done %d: %d\n",
	228	arizona->irq, ret);
	229	goto err_ctrlif;
	230	}
231
232	ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread,
233	flags, "arizona", arizona);
234
235	if (ret != 0) {
236	dev_err(arizona->dev, "Failed to request IRQ %d: %d\n",
237	arizona->irq, ret);
238	goto err_main_irq;
239	}
240
241	return 0;
242
243	err_main_irq:
244	free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
245	err_ctrlif:
246	free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
247	err_boot_done:
248	regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
249	arizona->irq_chip);
250	err_aod:
251	regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
252	arizona->aod_irq_chip);
253	err_domain:
254	err:
255	return ret;
256	}
257
258	int arizona_irq_exit(struct arizona *arizona)
259	{
260	free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona);
261	free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona);
262	regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1),
263	arizona->irq_chip);
264	regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0),
265	arizona->aod_irq_chip);
266	free_irq(arizona->irq, arizona);
267
268	return 0;
269	}